A font can be chosen with the mbfont command. The result is a description of a font, that can be used as the argument to other commands.
A maximum of 20 fonts can be selected for use in controls. Deleting a control does not release the font resource. A wd'reset' command frees all font resources.
Use the setfont command to set the font. For example, the following sets the font for control bn to: Lucida Console, 24 point, italic, bold:
wd 'setfont bn "Lucida Console" 24 italic bold'